
# id , type


c = 10
d = 10

print(id(c))
print(id(d))

print(c is d)


s1 = "abc"
s2 = "abc"

print(s1 is not s2)

print("*"*50)

s3 = "hello,123456"
s4 = "hello"

print(s4 in s3)
print(s4 not in s3)